why is norms so unbalanced

every time I play norms, the sides always seem to be drastically one-sided when it comes to rank/level. like, I have this game for example: https://i.imgur.com/FG9dAtf.png where most of the people on my team were pretty low elo or low level. but the enemy team had 2 diamond 3s. how in the world do a couple of unranked-gold players are paired with any diamond players at all, let alone 2 of them?? this isn't the only game I've played like this, and its pretty unacceptable. it was impossible to win against that enemy team, low elo players don't have that kind of skill or experience. this makes the game unenjoyable, like why even play it if this happens so often?
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